Figure legends
Fig 1. Age distribution of sensitization rate to major pollen in Seoul metropolitan area at study period. the pollen sensitization rate increased among <10 age of years children (3~5 years: 8.3%, 6~9 years: 14.4%, 10~12 years: 24.0%, 13~15 years: 25.4%, and 16~18 years: 27.6% in 1998; 3~5 years: 10.7%, 6~9 years: 17.7%, 10~12 years: 22.5%, 13~15 years: 23.9%, and 16~18 years: 25.3% in 2019).
Fig 2. The start and end dates of pollen season of major allergenic tree pollens in Seoul metropolitan area during the past 22 years. The start and end dates of pollen season were March 5 and June 7 respectively and the pollination duration was 94 days in 1998, with the start and end dates as February 15 and July 5, respectively. Meanwhile, the pollen season duration was 140 days in 2019.
Fig 3. The trend of total concentration of pollens (A) and peak tree pollen concentration (B) in Seoul metropolitan area during the study. Total concentration and peak concentration of pollens were increased gradually for the last 22 years.